Although the terrestrial planets just just three moons among them, the jovians have dozens of moons and amazing ring systems.  There are more objects, by far, that orbit planets than the planets themselves.  Currently, we know of roughly 150 moons in our solar system There are distinct types of natural satellites each of which seems to have a different origin.  Some have formed with the planets while others have been gravitationally stolen from other parts of the solar system.
Rings and Moons
Carpe Caelum Planetary Astronomy